Overview

ISIA is a GRUNDFOS owned company, manufacturing chlorine dioxide generation system. All ISIA solution are based on the “underwater” generation technology, considered as the safest method for chlorine dioxide generation. ISIA is offering two type of generators: OXIPERM ISIA, a standard generator with capacity from 0.5 kg/h to 30 kg/h, and customized solution, for system capacities above 20 kg/h up to 200 kg/h. ISIA systems technology is based on the reaction of two concentrated chemicals that produce chlorine dioxide using the solutions of sodium chlorite (NaClO2 25 % or 31 %) and hydrochloric acid (HCl 31-33 %).

Chlorine dioxide solution is produced on demand from concentrated reagents using the reliable sodium chlorite / hydrochloric acid process and is directly added to the water to be treated, without intermediate storage.

OXIPERM ISIA is available in six capacity levels, producing 0.5, 1, 2, 5, 10 and 20 kg/h of chlorine dioxide respectively, the system capacitates treating up to 20,000 m3 of water per hour at a maximum concentration of 1 mg/l ClO2.

Each of Oxiperm ISIA capacity level is available in three configurations:

L to produce chlorine dioxide directly in the basin with the water to be treated,

N to inject chlorine dioxide solution into a basin or a pipe at atmospheric pressure by gravity,

P to inject chlorine dioxide solution into a pipe under pressure

Oxiperm ISIA comes with No. 48 different base compact systems and more than 40 accessories, assuring a lot of possible combinations.

Applications

The Grundfos chlorine dioxide production system is suitable for all water treatment applications and can always be customized to meet the client’s requirements.

Chlorine dioxide (ClO2) selective reactivity makes it a powerful oxidizing agent useful in many water treating applications for which chlorine and other oxidizing agents are unsuitable.

Advantages on seawater:

The seawater pH is around 8.5, at that pH value chlorine is almost converted into hypochlorite ion, which is negative charged and only around 20% remains as un-dissociated hypochlorous acid.

Since also the bacteria wall is negative charged, hypochlorite cannot enter the cells to kill them, only hypochlorous acid can be active at that pH. That means you add 1 mg/L of chlorine but actually only 0.2 mg/L is effective against the seawater life.

On the contrary, chlorine dioxide acts as a gas dissolved in the seawater. It does not give dissociation and it is able to penetrate the bacteria cells in the same manner of the oxygen dissolved in the water. In other words, bacteria breaths chlorine dioxide instead of oxygen and die. Thanks to this characteristic, chlorine dioxide dosage rate is normally 3-5 times less than chlorine or hypochlorite providing even better performance and sure cost reduction.

Advantages on Potable water:

In potable water disinfection chlorine dioxide is much more efficient than chlorine or hypochlorite; it aids in reducing the formation of TTHMs and haloacetic acids (HAA) by oxidizing precursors, and by allowing the point of chlorination to be moved farther downstream in the plant after coagulation, sedimentation, and filtration have reduced the quality of natural organic material (NOM).

THMs are produced when free chlorine or bromine reacts with natural organic matter in the water. The identification of THMs in chlorinated water supplies led to concerns over their potential health effects including reproductive effects and the classification of chloroform, bromodichloromethane and certain other disinfection by-products (DBPs) as carcinogens.

Chlorine dioxide prevents THM formation by disinfecting without chlorinating organic materials and by oxidizing the organic THM precursors. Pre-treatment with chlorine dioxide oxidizes the THM precursors, which are removed during coagulation, settling, and filtration before final chlorination. This modification of standard chlorination practices can result in a 50 - 70 % decrease in TTHMs in the finished water.

Features & Benefits

Compact Design

Production on demand (available on time & on site thus eliminating the need for a storage tank)

Brochures

Chlorine dioxide (ClO2) is used in water treatment for domestic and industrial uses to reduce unpleasant odours, flavours and colours and remove mould and algae as well as to help remove iron and manganese from untreated water.
Specifically for water purification, chlorine dioxide has the major advantage of ensuring disinfected clean water from the tap where the action of other disinfectants such as ozone and ultraviolet
light is only temporary.